Research on Continuous Control Set Model Predictive Control of Three-Phase Four-Leg Inverter

This paper proposed a Continuous Control Set Model Predictive Control (CCS-MPC) strategy for a three-phase four-leg T-type three-level inverter. The topology includes three legs A, B and C, with an additional neutral leg N, and a smoothing inductor L
n
, providing a stable neutral point for the system. CCS-MPC and Sinusoidal Pulse Width Modulation (SPWM) are applied to generate output voltages that are capable of handling various load conditions. In the αβγ reference frame, the CCS-MPC strategy aimed to construct a cost function to find the input voltages that minimize the cost function, generating higher quality voltage on the output side of the inverter, capable of driving unbalanced and nonlinear loads. Simulation results demonstrate the effectiveness of the proposed control strategy.